为什么我的form得不到页面上的数据

formbean属性名与也面上的html对象没对应上

解决方案 »

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原因太多了，最好把页面的,<form  。>标签，以及struts-config.xml中相关的配置文件贴出来。
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %><html>
<head>
  <title>Register</title>
</head>
<body>
<html:form action="register">
<br>
UserName:  <html:text property="userName"/> <br>
<br>enter password:  <html:password property="password"/> <br>
<br>re-enter password:  <html:password property="confirmPassword"/> <br>
  <html:hidden property="do" value="register" />

<html:submit>Save</html:submit></html:form>
</body>
</html><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
   <data-sources />
   <form-beans >
      <form-bean name="registerForm" type="cn.weixin.struts.form.RegisterForm" />   </form-beans>   <global-exceptions />
   <global-forwards />
   <action-mappings >
      <action
         attribute="registerForm"
         name="registerForm"
         parameter="do"
         path="/register"
         scope="request"
         type="cn.weixin.struts.action.RegisterAction">
         <forward
            name="success"
            path="/jsp/success.jsp"
            redirect="true" />
         <forward
            name="fail"
            path="/jsp/fail.jsp"
            redirect="true" />
      </action>   </action-mappings>   <message-resources parameter="cn.weixin.struts.ApplicationResources" />
</struts-config>public class RegisterForm extends ActionForm {    private Register register = new Register();

    public Register getRegister()
    {
        return this.register;
    }

    public String getUserName()
    {
        return register.getUserName();
    }

    public String getPassword()
    {
        return register.getPassword();
    }

    public String getConfirmPassword()
    {
        return register.getConfirmPassword();
    }
    }
請大家給看看,謝了
你的名称的大小写有关吗?象userName,password,confirmPassword这是网页中的名称,而实现tagLib中的名称却是UserName,Password,ConfirmPassword,不知道是不是这方面的原因?其实我不懂,但我觉得Java中的大小写是很敏感的.
<html:form action="register">
改成<html:form action="/register">
最好把"<html>"也写成"<html:html>",曾经碰到过这样的错误
谢谢大家了，上面的问题解决了，原因是form中没有写set方法
现在有一个问题，当文本框没有输入时，form总是不能得到null，不知何故？
我的tomcat启动时，总是抛出下面的异常，请大家指点
严重: Parse Error at line 2 column 221: Document root element "web-app", must match DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "web-app", must match DOCTYPE root "null".
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.rootElementSpecified(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:282)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:639)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:243)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3568)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:821)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:579)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:307)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:772)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:559)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:401)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:718)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:358)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1196)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
at org.apache.catalina.core.StandardService.start(StandardService.java:497)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
2005-11-14 21:22:28 org.apache.commons.digester.Digester error
严重: Parse Error at line 2 column 221: Document is invalid: no grammar found.
org.xml.sax.SAXParseException: Document is invalid: no grammar found.
at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.handleStartElement(Unknown Source)
at org.apache.xerces.impl.dtd.XMLDTDValidator.startElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentScannerImpl$ContentDispatcher.scanRootElementHook(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.ContextConfig.applicationConfig(ContextConfig.java:282)
at org.apache.catalina.startup.ContextConfig.start(ContextConfig.java:639)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:243)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:3568)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:821)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:807)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:579)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDeployer.java:307)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:772)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:559)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:401)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:718)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:358)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1196)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347)
at org.apache.catalina.core.StandardService.start(StandardService.java:497)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:2190)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
一楼说得对，页面中的属性和form中的属性大小写一致。
二楼说得也对，还不行的话不妨换成action="/register.do"试试
form中的每个属性都要定义get和set方法，因为在提交的时候struts会自动调用set方法。
为什么要得到NULL值呢？
你可以在未输入信息前进行验证啊。
我没有作页面上的检查,当页面没有输入时,action得到的不是null,也不是空字符串